Central Bureau for Astronomical Telegrams
IAUC 5356: 1991az; 1991ax; 1991ay; 1991n
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Circular No. 5356
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
SUPERNOVA 1991az IN ANONYMOUS GALAXY
J. Mueller reports her discovery of a supernova (blue mag about
18) located 10".1 west and 3".4 south of the center of a galaxy at
R.A. = 2h22m.4, Decl. = +24 02' (equinox 1950.0). The discovery
plate was taken by J. D. Mendenhall and Mueller on Sept. 15 UT with
the 1.2-m Oschin Telescope in the course of the second Palomar Sky
Survey.
A. V. Filippenko and T. Matheson, University of California at
Berkeley, report that a CCD spectrogram (range 390-710 nm, resolution
1 nm), obtained on Oct. 2 UT with the Shane 3-m reflector at
Lick Observatory, shows that SN 1991az is of type II. Broad H-alpha
emission is prominent, but the corresponding absorption line is weak.
SUPERNOVA 1991ax IN ANONYMOUS GALAXY
M. Della Valle and C. Gouiffes, European Southern Observatory,
report: "A spectrum of SN 1991ax obtained with the New Technology
Telescope (+ EMMI) at La Silla on Sept. 30.3 UT shows a strong and
broad H-alpha emission (FWZI = 34 nm), indicating that this is a
type-II supernova about 2 weeks after maximum."
H. E. Bond, Space Telescope Science Institute, reports the
following CCD V magnitudes, obtained with the Cerro Tololo Interamerican
Observatory 0.9-m telescope, showing that SN 1991ax reached maximum
around Sept. 24: Sept. 18.35 UT, 17.89; 20.26, 17.77; 22.28,
17.70; 24.27, 17.70; 26.38, 17.71; 28.36, 17.81.
SUPERNOVA 1991ay IN ANONYMOUS GALAXY
Filippenko and Matheson also report that a CCD spectrum obtained
with the Shane reflector on Oct. 2 UT shows that SN 1991ay is
of type I. The subclass could not be reliably determined from
preliminary inspection of the uncalibrated spectrum.
PERIODIC COMET FAYE (1991n)
Total visual magnitude estimates (cf. IAUC 5348): Sept. 17.06
UT, 11.3 (J. Shanklin, Cambridge, England, 0.3-m refractor); 19.07,
10.6 (B. H. Granslo, Fjellhamar, Norway, 0.20-m reflector); Oct.
2.36, 9.9 (C. Spratt, Victoria, BC, 0.20-m reflector).
1991 October 2 (5356) Daniel W. E. Green
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